Here is the description found at the Oskar Mathieu Archiv :
A battery bus that is “independent of rail, overhead lines and fuel,” presented Wegmann & Co., wagon factory and vehicle construction,
in 1951. The electric drive was powered of this bus (capacity: 56 people) from Afa batteries that are in were carried on a trailer with twin tires. The rest is electrical
Equipment came from the Hans > Still motor factory, Hamburg, and Schaltbau G.m.b.H., Munich.
Withone battery charge, 80 kilometers could be driven, and the vehicle's maximum speed was 35 km/h. The Wegmann battery bus
didn't make it past being a prototype out. However, they became more widespread the Wegmann trolleybuses (capacity: 90 people) and Wegmann light metal bus trailers manufactured in the early fifties became. The Wegmann company exists still today and is especially in the area active in defense technology.